Daisy-chained SAS power-up order
Posted on 2007-09-28
I have a DL380 G5 with an additional P800 SAS controller in a PCIe slot, it has two external 4-lane SAS ports. On one of the external ports of the P800 I have an MSA70 disk shelf [with an input and output SAS port] and connected to that MSA70 there is another MSA70. Let us call them Server, diskbox1 and diskbox2.
Question: In what order should I power them on?
Before someone suggests I eliminate the 'peripheral of a peripheral' problem because I have two external channels I have four MSA60s daisy-chained together on the other external SAS port and the same question applies to that chain.
Second question: What is it that ultimately controls this recommended power up order?